1200 carb question

[crackercap]

my 1200 after sitting for many years is finally running, it starts up good using choke, idles perfectly, but is slow in throttle response. after warming up about 5 minutes with choke off it will not respond to quick throttle. If I close choke, it will respond much better but has a small backfire at about 4000 rpm. I have had the carbs off twice and cleaned them and put new kits in. I have not synchronized them as I do not have the gauge assembly to do this and am reluctant to buy the gauges as I do not intend to keep the bike. Looking for suggestions as to what may cause this slow response in throttle and if synchronization could be the culprit. I have read where synchronization is mainly for idle and low throttle operation. THANKS..

[twocams]

Its nice if all 4 carbs are pulling their own weight all the time. Make sure there aren't any vacuum leaks anywhere. Make sure the throttle cables are on the wheel right. The way they push and pull on the wheel they hook too. Are all 4 cylinders( spark plugs) firing up to & at 4000 RPM. Fresh gas & some sea foam might help.

twocams

[crackercap]

thanks for your reply, it appears now that I wasn't giving it enough time to thoroughly warm up, after warming up good, I can release the choke fully and it has much better response. Yes, I did use sea foam and appears to have helped greatly. Just have to get it out now and take it for an extended ride if I decide to keep it. Thanks again for your reply.